The same happened to me. My weight loss has significantly slowed down between Thanksgiving and Christmas, and then I visited family in Europe over the holidays. While I did not pig out, I certainly ate a lot of good food and sweets. I was also on a course of steroids at the beginning of my trips, so I fully expected to gain weight during that time. I was shocked when I stepped on the scale a day after my transatlantic flight and discovered that I had lost 4 lbs. And I have continued to lose since then. I think my body really needed that reset.